It was only her second competitive appearance since winning gold at London 2012 and she finished fourth in the 100m hurdles and eighth out of eight in the long jump.

"Up until now we have been focusing on managing the pain so I can train and get myself in shape to win in Moscow," she said. "The time has now come to stop chasing fitness and look to cure the problem."

Coach Toni Minichiello explained there had not been enough improvement in the athlete's condition to ensure she could complete both days of the heptathlon event in Moscow.

"There are nine global medals up for grabs over the next three years not including Moscow," he said. "So a long term view has been taken."

Minichiello added that while Ennis-Hill was disappointed to be missing the World Championships, she was also relieved to be able to move on.

"Up until this point it was maybe she can go, maybe not, and it is difficult to be on the edge like that," he added.

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Toni Minichiello on Ennis-Hill injury

"Yes it is not the best decision because it is a negative, but a decision has been made and I think as a sportsperson you get a lot of solace from that because the line in the sand has been drawn and you can step forward and move on from it."

Neil Black, UK Athletics performance director, said: "No-one wants to see her competing in pain. We look forward to seeing her wear the Great Britain and Northern Ireland vest again in 2014."

Ennis-Hill's withdrawal from the Great Britain squad means the remaining track and field athletes who won gold at London 2012 are long-distance runner Mo Farah and long jumper Greg Rutherford, who was himself selected
despite fitness concerns.

UK Athletics said there would be no replacement for Ennis in the squad as none of the potential candidates had reached the required 'A' qualifying standard.

I think you will find it is about commitment - both personal and professional.These games were billed as being the biggest event to take place since the 2012 Olympics.This was a chance for a lot of people to see world class athletes in action.

I am sure she was aware of the groundswell of public support and affection for her- and thus had a difficult decision to make .

Too much fawning over so-called heroes, superstars, champions. These are people ultimately out for what they can get. Oh of course, they sacrifice so much to train etc etc. They contribute nothing tangible to the world and would not 'sacrifice' themselves if they did not see those dollars, adulation and other gains potentially landing at their feet only getting out of bed after counting the cash.

@42-sadly admit you may be right-with Colin Jackson there(groan!)@54-so you think she will be breaking Jackie JK's world record-would have to be to be 'miles better'. @55 why all the !!!!-and assume you have inside knowledge from her physio/medical team? @56assume you talked to her about the 100m hurdles? Could it be she couldn't ger herself 'up' again after all the emotion of winning?

Sorry for Jess all round, especially because of the numbskulls at Sheffield City Council who are destroying her training ground. 'Her' Don Valley Stadium is an architectural Horror Show, but the Athletics facilities are top notch. Look at it's replacement. Just a running track in the middle of a rubbish tip, in a run-down area of Sheffield that is a total embarrassment for various other reasons.

Good Lord...I hope KJT becomes an amazing athlete but you say it with such confidence...so in a couple of years KJT will have won the Europeans, Worlds and Olympics? which by the way wouldn't make her "miles better" than Jessica but would merely match her achievements...

Hopefully she gets statutory sick pay to see her through this tough time. If she doesn't I will be outraged, and hopefully you'll all join me in petitioning to get her on the BBC elite panel of commentators.

I'm a masive Ennis fan and she's a great role model but I think the Santander ads are a mistake. They are at least partly responsible for the financial crisis that is not unconnected with the closure of the Don Valley stadium

I’m surprised it took so long to take this decision. Even if 95% fit, she would’ve had little chance in such a demanding sport at the WCs and defeat could have dented her confidence. Athletes are very poor at making these decisions, as they are natural competitors. Her coach should have convinced her earlier to avoid all this anguish. At least the right decision has been made in the end.

To be fair comment 33 might have a point. Take the olympics, for example. The reason she didn't want to compete in the 100mh was the she didn't want to sully the memories of her gold medal by winning a lesser medal (or not getting a medal at all) in the individual event.

Do I agree with it, no. It is was me, I would've competed in the individual too.

What I don't understand is why they haven't tried to fix the problem before now!!! Why were they focused on managing the pain instead of getting the problem fixed!! You have to question everyones decisions on this!!!!

33 - having seen her compete in London on Friday and Saturday, it seemed that she was 'protecting' her injury as far as she could.If she went to the World Championships, she could make the injury far worse - and an achilles injury can take a long time to heal.

Can't agree that she has pulled out due to sponsors. In fact she has probably been struggling to compete rather than rest because of pressure from sponsors.

I have seen it first hand and unless the competitor or those around have the the strength to force sponsors, or more likely their PR company, to back down so allowing proper recovery the competitor can end up with even worse injuries.

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